Client Computers not showing in Update Services Console

HI,

SBS 2011 Standard

5 x Windows 8 Pro Client Computers

Just noticed that none of the Client computers have been updating, I suspect since installation. (Standard default server installation)

Observations:-

1. Client Computers not showing in Update Services Console
2. Client computers all show in SBS 2011 Standard Console but in Network>Computers under Update Status it displays - UnKnown
3. Client Computers cannot directly access online Windows Update, stating that updates are "Managed by your system administrator"
4. Client Computers do receive Anti Virus and Spyware updates via Server and SBS 2011 Standard Console provides details of client computers that required these updates when required.
5. Server - Shows in Update Services Console under "Update Services Server Computers" and in SBS 2011 Standard Console>Network>Computers under Update Status it displays - OK

Any reason why Client Computers do not show in Update Services Console yet receive Anti Virus and Spyware updates?

Thanks